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动作类代码:
public String down() throws Exception{
//获取application
ServletContext sc = ServletActionContext.getServletContext();
//获取服务器上的文件存放的绝对路径
String realPath = sc.getRealPath("/upload/1.jpg");
//获取输入流
inputStream = new FileInputStream(realPath);
//获取文件名
fileName = FilenameUtils.getName(realPath);
//给文件名编码
fileName = URLEncoder.encode(fileName, "utf-8");
//获取文件大小
filelength = inputStream.available();
return SUCCESS;
}
"struts.xml"配置文件:
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
"http://struts.apache.org/dtds/struts-2.3.dtd">
<struts>
<constant name="struts.devMode" value="true"></constant>
<constant name="struts.multipart.maxSize" value="1024000"></constant>
<package name="upload" extends="struts-default" namespace="/down">
<action name="down" class="com.rl.action.DownAction" method="down">
<result name="success" type="stream">
<param name="inputName">inputStream</param>
<param name="contentDisposition">attachment;filename=${fileName}</param>
<param name="contentType">application/octet-stream</param>
<param name="contentLength">${filelength}</param>
</result>
</action>
</package>
</struts>
服务器中需要有相应的文件:
访问结果: